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F. H. GROVE, E. M. McCURRY AND G. R. BILGER.

COLLAPSIBLE CORE.

APPLICATION man mAvsl. m9.

, 25,670. Patented Dec. 23, 1919.

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OFFICE.

FRANK H. GROVE, EARL lift. ll'JIoCUItR'iL hllD GEORGE R. IBILGER, OF COLUMBIANA, OHIO,

ASSIGNORS TO THE BANNER MACHINE COMPANY, OF GOLUMBIANA, OHIO, A. CORPO- RATION OF OHIO.

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COLLAPSIBLE CORE.

Specification of Letters Patent. Patented Dec; 23, 1919 Application filed May 31, 1919. Serial No.,301,130.

To all whom it may concern:

Be it known that we, F RANK H. Grove, Farm M. McCunRY, and Gnonen R. Brnenn, citizens of the United States, residing at Columbiana in the county of Columbiana and State of Ohio, have invented a new and useful Collapsible Core, of which the following is a specification.

This invention relates to improven'ients in separable cores or mandrels which form the outer casings of pneumatic tires.

The object of the invention is to provide a core comprising an annulus made up of separable sections, each section having a shouldered inner portion, an annular ring arranged to be located within the annulus and clamping rings arranged to engage the shouldered portions and draw the sections of the annulus into tight engagement with the inner ring.

With these objects in View the invention consists in the novel construction and arrangement of parts, hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of construction may be made within the scope of the appended claims, without departing from the spirit or sacrificing any of the advantages of the invention.

The invention thus set forth in general terms is illustrated in the accompanying drawings: forming part hereof, in which- Figure 1 is a side elevation of an assem bled core embodying the invention; and

Fig. 2, a section on line 22, Fig. 1.

A practical embodiment of the invention is disclosed in the accompanying drawings, forming a part of this specification in which similar numerals of reference indicate corresponding parts throughout the several vlews.

The core embodying the invention comprises an annulus formed of separable sections 1, each section including a body portion. 2 substantially circular in cross section; and an inwardly extending flange 3 provided with. an enlarged marginal portion 4: having tapered shoulders 5 around its periplr cry.

An inner straight ring 6 is arranged to be placed within the center of the annulus and is preferably provided wlth an annular shoulder 7 arranged to be received within the annular depression 8 formed in the annulus. A pair of clamping rings 9, each provided with an inner beveled edge 10, are

arranged to be forced upon the tapered shoulders 5 of the annulus drawing the separable sections of the annulus into tight engagement with each other and with the inner ring 6.

When the core is to be removed from the tire, the clamping rings 9 may be removed through the instrumentality of a suitable tool inserted in the sockets 11, which are provided in each side of each of the separable sections of the annulus. When the clamping rings are removed the inner ring 6 may be easily withdrawn from the annulus and the sections of the annulus collapsed.

It will be noted that the construction above described reduces the parts to a minimum and simplifies the construction and operation of separable cores. The clamping of the separable sections of the core upon the inner ring is assured by the use of the two clamping rings and all bolts, nuts and other detachable parts are eliminated, the parts being enabled to be assembled or collapsed by the driving of the clamping rings upon the annular shoulders of the sections or the removal of the clamping rings therefrom.

Although the drawings and above specification disclose the best mode in which we have contemplated embodying our invention we desire to be not limited to the details of such disclosure, for, in the further practical application of our invention, many changes in form and construction may be made, as circumstances require or experience suggests, without departing from the spirit of the invention, within the scope of the appended claims.

VVe claim:

1. A sectional tire core including an annular flange formed with tapered, annular, outwardly facing shoulders and a strailght inner surface, an inner straight ring adapted to engage the inner surface of the flange and clamping rings adapted to fit over said tapered shoulders to press said flange against the inner ring.

2. A sectional tire core including an annular flange formed with tapered, annular, outwardly facing shoulders and a strailght inner surface, an inner straight ring adapted to engage the inner surface of the flange and tapered clamping rings adapted to fit over said tapered shoulders to press said flange against the inner ring.

3. A sectional tire core including an annular flange formed with tapered, annular, outwardly facing shoulders and a straight inner surface, an inner straight ring adapted to engage the inner surface of the flange and tapered clamping rings adapted to fit over said tapered shoulders to press said 10 flange against the inner ring, said flange being provided with spaced sockets extending beneath the clamping rings.

In testimony that we claim the above we have hereunto subscribed our names.

FRANK H. GROVE. EARL M. MoCURR-Y. GEORGE R. BILGER. 

